MAUREEN Dowd is too busy to reply to fans, but she does have enough time to sell them her book. A Dowd reader who sent an e-mail to her New York Times address was ruffled by this reply: “Thank you . . . I try to reply individually but often receive too many for that to be possible. I do read each letter and truly appreciate your feedback . . . If you are interested in ordering my new book, ‘Are Men Necessary?’ here’s the link to Amazon.com.” A Times rep said the reader used “an old e-mail address that should have been de-activated,” adding the paper does get “a portion” of the book’s profits.